I have built 11 K2's, all options, including DSP, plus a K1 and a KX1.
I apologize that I am unable to continue building for free.
My fee, which depends on the kit, is between 10% to 15% of the cost of the kit
plus shipping. Please email build_AT_newpony_DOT_com for details and references, if you like.
There are other builders who may build free of charge. Check the builders list at www.elecraft.com